Email:
Gmail only for 1 account.
Nine for everything else.
Calendar:
Samsung for alerts.
Google for widget and day-to-day use.
Tasks/Reminders:
Samsung Notes for static info
Microsoft To-Do for checklists & collab (+killer widget)
SMS:
Google (can react to iMessage messages, and hopefully 2FA cleanup will come soon)
Keyboard:
Gboard (can backup/restore my personal dictionary and superior in all ways that I need to use it, including Urdu/arabic.)
Device Backup:
Both
Photo backup:
Microsoft OneDrive
